This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 29 |
| 4 | 274 |
| 5 | 3145 |
| 6 | 42294 |
| 7 | 651227 |
| 8 | 11295242 |
| 9 | 217954807 |
| 10 | 4632600152 |
| 11 | 107572674851 |
| 12 | 2710093290348 |
| 13 | 73635362430373 |
| 14 | 2146667383237600 |
| 15 | 66842659455306545 |
| 16 | 2214207331808233390 |
| 17 | 77752904712525291757 |
| 18 | 2885163506590219810722 |
| 19 | 112808263228714108970879 |